Cam issue!
Cam issue! I know this may not be in the right section but i need everyones opinion. I wanted to see what yall guys think could make this happen and maybe why. My car was running like crap so i took it back to the shop and we find out that one of the lobes on the cam is rounded off. We found out because one of the valves was only lifting about .100 Just wanted to know what causes this and why. Its a hydraulic flat tappet cam just incase that helps. Could it just be a bad part or could something be wrong with any of the valvetrain? We already replaced the cam and is getting put back together as we speak. Thanks!
I know this may not be in the right section but i need everyones opinion. I wanted to see what yall guys think could make this happen and maybe why. My car was running like crap so i took it back to the shop and we find out that one of the lobes on the cam is rounded off. We found out because one of the valves was only lifting about .100 Just wanted to know what causes this and why. Its a hydraulic flat tappet cam just incase that helps. Could it just be a bad part or could something be wrong with any of the valvetrain? We already replaced the cam and is getting put back together as we speak. Thanks!
Common problem w/flat tappets of the 60's, 70's, & 80's. GM had several bad batches of hardening & if it was not broke in at a high enough RPM on intial start up the wear started right away...but not noticed usually for 20-30-50k miles until you get a miss that slowly gets worse with miles.
Launching!
Joined: Oct 2006
Posts: 267
Likes: 0
From: Las Cruces, NM
i had this problem with two cams of the same manafacturer completely different motors. one was a BBC and the other was a SBC. Other than that sounds like a flattend cam. Nothing you can really do except replace and hope it didnt get to your bearings.
Well the shop checked it out and they said that most of the metal got caught by the filter but that they were going to do a couple of oil changes and wear the cam in. They said everything should be good afterwards. They said this is a rare thing that happens.
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On The Tree
Joined: May 2005
Posts: 174
Likes: 0
From: Catawissa PA
As everybody already cover, but couple othter things too.
1) Make sure the lifter moves smoothly in the bore, if it's sticking at all that could cause ware. Make sure the botton of the lifter has no burrs, and make sure you coat the lifter and cam with plenty of lube, a dry start could kill the cam lobe, one small nick is all it takes.
2) Always start a fresh engine on standard dino oil, not synthetic, I also always use a breakin additive, I perfer GM's. I use a quart of the initial start-up ( 20 minutes run time, then use another on that oil shance, and change that oil after 100-150 miles. * Note this is oil addative and not assemble lube, thet are different. Assembly lube is thick, think enough to clog the oil filter ( main reason you change the oil after 20 minutes ).
3) When you first start the engine you want to run it for 20 minutes. As soon as it starts take it up to 1,700-2,000 RPMs for 5 minutes, thaen vary the RPMs between 1000 and 2500 for a few minutes each.
1) Make sure the lifter moves smoothly in the bore, if it's sticking at all that could cause ware. Make sure the botton of the lifter has no burrs, and make sure you coat the lifter and cam with plenty of lube, a dry start could kill the cam lobe, one small nick is all it takes.
2) Always start a fresh engine on standard dino oil, not synthetic, I also always use a breakin additive, I perfer GM's. I use a quart of the initial start-up ( 20 minutes run time, then use another on that oil shance, and change that oil after 100-150 miles. * Note this is oil addative and not assemble lube, thet are different. Assembly lube is thick, think enough to clog the oil filter ( main reason you change the oil after 20 minutes ).
3) When you first start the engine you want to run it for 20 minutes. As soon as it starts take it up to 1,700-2,000 RPMs for 5 minutes, thaen vary the RPMs between 1000 and 2500 for a few minutes each.
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Verdad Gallardo I will but maybe later man! I dont have enough money to go hydraulic roller right now. So ima have to stick to hydraulic flat tappet. Do yall think that flat tappet is good to use on a racing engine that reaches 6000 rpm?
As everybody already cover, but couple othter things too.
1) Make sure the lifter moves smoothly in the bore, if it's sticking at all that could cause ware. Make sure the botton of the lifter has no burrs, and make sure you coat the lifter and cam with plenty of lube, a dry start could kill the cam lobe, one small nick is all it takes.
2) Always start a fresh engine on standard dino oil, not synthetic, I also always use a breakin additive, I perfer GM's. I use a quart of the initial start-up ( 20 minutes run time, then use another on that oil shance, and change that oil after 100-150 miles. * Note this is oil addative and not assemble lube, thet are different. Assembly lube is thick, think enough to clog the oil filter ( main reason you change the oil after 20 minutes ).
3) When you first start the engine you want to run it for 20 minutes. As soon as it starts take it up to 1,700-2,000 RPMs for 5 minutes, thaen vary the RPMs between 1000 and 2500 for a few minutes each.
1) Make sure the lifter moves smoothly in the bore, if it's sticking at all that could cause ware. Make sure the botton of the lifter has no burrs, and make sure you coat the lifter and cam with plenty of lube, a dry start could kill the cam lobe, one small nick is all it takes.
2) Always start a fresh engine on standard dino oil, not synthetic, I also always use a breakin additive, I perfer GM's. I use a quart of the initial start-up ( 20 minutes run time, then use another on that oil shance, and change that oil after 100-150 miles. * Note this is oil addative and not assemble lube, thet are different. Assembly lube is thick, think enough to clog the oil filter ( main reason you change the oil after 20 minutes ).
3) When you first start the engine you want to run it for 20 minutes. As soon as it starts take it up to 1,700-2,000 RPMs for 5 minutes, thaen vary the RPMs between 1000 and 2500 for a few minutes each.
